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How exactly is scissor rect used in DX9?

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hi all

I'm just curious how exactly scissor rect is used in DX9?
There is little about it in the doc.

And i know that there is a render state "D3DRS_SCISSORTESTENABLE" to be enabled if scissor rect is used.

I tried enabled it and set the rect before clear operation , it worked fine but the text is not clipped.
But if I moved the operations after the clear operation , it didn't work at all.

What's is going on under the hood??

somebody give me some tips , appreciate it !!

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